Document
Varactor-Tuned Oscillators Technical Data
VTO-8000 Series
Features
• 600 MHz to 10.5 GHz Coverage • Fast Tuning • +7 to +13 dBm Output Power • ± 1.5 dB Output Flatness • Hermetic Thin-film Construction
Description
HP VTO-8000 Series oscillators use a silicon transistor chip as a negative resistance oscillator. The oscillation frequency is determined by a silicon abrupt varactor diode acting as a voltage-variable capacitor in a thin-film microstripline resonator. This provides extremely fast tuning speed, limited primarily by the internal impedance of the user-supplied voltage driver. Fast settling is another feature of the HP VTO-8000 Series oscillators. Typical settling times for the VTO-8090 are <200␣ kHz within one microsecond while the VTO-8950 settles to <2␣ MHz within two microseconds referenced to ten milliseconds. The VTO-8850 combines a bipolar transistor oscillator with a GaAs FET buffer stage. This GaAs FET buffer isolates the oscillator from
variations in load impedance for low frequency pulling, allows the oscillator to run lighty-loaded for low phase noise content and provides +10 dBm of minimum output power over the full tuning range. The VTO-8000 Series varactor-tuned oscillators are packaged in TO-8 transistor cans for simple installation in a conventional 50-ohm microstripline PC board. They are ideal for most compact, lightweight commercial and military equipment designs. Test fixturing is also available for lab bench test applications. See the “Test Fixtures for TO-8 Packages” section for additional information and outlines.
Pin Configuration
TO-8V
GROUND +V TUNE 2 1 3 4
RFOUT
+DC VOLTAGE
CASE GROUND
Applications
Frequency agile systems, such as digitally controlled receivers and active jamming transmitters often use externally linearized varactor-tuned oscillators. HP oscillators are monotonic making external linearization easy using analog (opamp) or digital (EPROM) linearizing techniques. The HP VTO Series has been designed with a tuning input bypass capacitance which is sufficient to provide the necessary RF filtering action yet as low
as possible to maximize ∆ V/∆ T characteristics for excellent tuning speeds. Used in a phase locked loop PLL circuit, a VTO provides a receiver LO with stability equivalent to the reference oscillator (usually crystal controlled), yet variable in discrete steps or continuously depending on the PLL configuration. Another important aspect of VTOs used in an LO application is their power vs. frequency flatness (± 1.5␣ dB). This assures that once a receiver mixer is biased for best dynamic range the local oscillator drive will remain constant throughout the tuning range without complex leveling circuitry.
9-23
5964-9815E
Electrical and Performance Specifications
Guaranteed Specifications @ 25°C Case Temperature (0° to +65°C Operating Temperature)
Part Number Frequency Range, Min. Power Output into 50–ohm Load,Min. Power Output Variation @ 25°C, Max. Operating Case Temperature Range Frequency Drift Over Operating Temperature, Typ. Pulling Figure (12 dB Return Loss), Typ. Pushing Figure, +15 VDC Supply, Typ. Harmonics, Below Carrier, Typ. Spurious Output Below Carrier, Min. Tuning Voltage Low Frequency High Frequency Maximum Tuning Voltage Tuning Port Capacitance, Nom. Phase Noise, Singie Sideband, 1 Hz Bandwidth, Typ. 50 kHz From Carrier 100 kHz From Carrier Input Power ± 1% Regulation Voltage, Nom. Current, Max. Case Style VTO–8060 VTO–8080 VTO–8090 900–1600 MHz 20 mW/+13 dBm ± 1.5 dB 0° to +65°C 10 MHz 25 MHz 6 MHz/V –15 dB –60 dB 2± 1 VDC 48+8/–10 VDC +60 VDC 180 pF VTO–8150 VTO–8200 600–1000 MHz 800–1400 MHz 20 mW/+13 dBm 20 mW/+13 dBm ± 1.5 dB ± 1.5 dB 0° to +65°C 0° to +65°C 8 MHz 10 MHz 25 MHz 5 MHz/V –15 dB –60 dB 3± 1 VDC 40± 8 VDC +60 VDC 180 pF 25 MHz 6 MHz/V –15 dB –60 dB 2± 1.5 VDC 35± 10 VDC +60 VDC 180 pF 1500–2500 MHz 2000–3000 MHz 10 mW/+10 dBm 10 mW/+10 dBm ± 1.5 dB ± 1.5 dB 0° to +65°C 0° to +65°C 18 MHz 30 MHz 35 MHz 6 MHz/V –15 dB –60 dB 2.5± 1 VDC 47± 8 VDC +60 VDC 90 pF 35 MHz 6 MHz/V –18 dB –60 dB 2+2/–1 VDC 20± 4 VDC +45 VDC 45 pF
–110 dBc/Hz –117 dBc/Hz +15 VDC 50 mA TO–8V
–100 dBc/Hz –107 dBc/Hz +15 VDC 50 mA TO–8V
–100 dBc/Hz –107 dBc/Hz +15 VDC 50 mA TO–8V
–95 dBc/Hz –102 dBc/Hz +15 VDC 50 mA TO–8V
–95 dBc/Hz –102 dBc/Hz +15 VDC 50 mA TO–8V
Part Number Frequency Range, Min. Power Output Into 50–ohm Load, Min. Power Output Variation @25°C., Max. Operating Case Temperature Range Frequency Drift Over Operating Temperature, Typ. Pulling Figure (12 dB Return Loss), Typ. Pushing Figure, +15 VDC Supply, Typ. Harmonics, Below Carrier, Typ. Spurious Output Below Carrier, Min. Tuning Voltage Low Frequency High Frequency Maximum Tuning Voltage Tuning Port Capacitance, Nom. Phase Noise, Single Sideband, 1 Hz Bandwidth, Typ. 50 kHz From Carrier 100 kHz From Carrier Input Power ± 1% Regulation Voltage, Nom. Current, Max. Case Style
VTO–8240 2400–3700 MHz 10 mW/+10 dBm ± 1.5 dB 0° to +65°C 30 MHz 35 MHz 6 MHz/V –18 dB –60 dB.